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Pervasive Data Access (PDA) Research Group. Mei Li Pennsylvania State University. Overview. Investigate various research issues involving data access and management in a wide spectrum of pervasive/mobile computing and networking environments peer-to-peer networks mobile ad-hoc networks

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Pervasive data access pda research group l.jpg

Pervasive Data Access (PDA) Research Group

Mei Li

Pennsylvania State University


Overview l.jpg
Overview

  • Investigate various research issues involving data access and management in a wide spectrum of pervasive/mobile computing and networking environments

    • peer-to-peer networks

    • mobile ad-hoc networks

    • wireless sensor networks

  • Also investigate object-oriented databases, XML, security, and information integration and retrieval

2


Peer to peer p2p systems l.jpg
Peer-to-Peer (P2P) Systems

  • Peer-to-Peer computing paradigm has changed the ways large-scale distributed systems are built and operated.

  • Goal of our research

    • design data management systems to support various applications ranging from distributed research locating to network attack detection

  • We Investigate

    • Information management infrastructure

    • Complex queries processing

    • Knowledge discovery (clustering, outlier detection)

  • We address various system issues

    • overlay maintenance, load balancing, resilient to dynamic changes, adaptivity to query locality

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Location-aware Wireless Sensor Networks (WSNs)

  • WSNs have a wide range of applications

    • object tracking, environmental monitoring, warehouse inventory, and health care.

  • Goal of our research

    • build data management systems in support of data collection, aggregation, dissemination, in-network query processing and query optimization.

  • We investigate

    • location tracking of moving objects

    • location-based routing

    • complex query processing (window, KNN, and aggregation queries)

    • Spatio-temporal modeling and estimation of wireless link quality in sensor networks

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Mobile and Pervasive Data Access

  • Important for a wide range of mobile businesses and applications.

  • We are one of the first few pioneers who started research in this area

    • Indexing

    • Caching

    • Accessing

    • Data aggregation

    • Data dissemination

    • Channel allocation

    • Query processing

  • Our work has extensive coverage

    • from simple data to spatial data

    • from single cell to multiple cells

    • from stationery clients to moving clients

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Location-Based Services (LBSs)

  • LBS is one of the killer applications for mobile computing and wireless data services.

  • We investigate

    • indexing and caching spatial data to support the processing of location based spatial queries (LBSQs)

      • point query, window query, k nearest neighbor (KNN) search, continuous nearest neighbor (CNN) search, spatial join, and other complex spatial queries

  • We address various issues

    • large index search space, large index size, linear streaming property of wireless data broadcast, continuous movement and requests of mobile users, and cache replacement/invalidation

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Contact Information

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